Tiwei Bie 4c8cf31885 vhost: introduce vDPA-based backend ... This patch introduces a vDPA-based vhost backend. This backend is built on top of the same interface defined in virtio-vDPA and provides a generic vhost interface for userspace to accelerate the virtio devices in guest. This backend is implemented as a vDPA device driver on top of the same ops used in virtio-vDPA. It will create char device entry named vhost-vdpa-$index for userspace to use. Userspace can use vhost ioctls on top of this char device to setup the backend. Vhost ioctls are extended to make it type agnostic and behave like a virtio device, this help to eliminate type specific API like what vhost_net/scsi/vsock did: - VHOST_VDPA_GET_DEVICE_ID: get the virtio device ID which is defined by virtio specification to differ from different type of devices - VHOST_VDPA_GET_VRING_NUM: get the maximum size of virtqueue supported by the vDPA device - VHSOT_VDPA_SET/GET_STATUS: set and get virtio status of vDPA device - VHOST_VDPA_SET/GET_CONFIG: access virtio config space - VHOST_VDPA_SET_VRING_ENABLE: enable a specific virtqueue For memory mapping, IOTLB API is mandated for vhost-vDPA which means userspace drivers are required to use VHOST_IOTLB_UPDATE/VHOST_IOTLB_INVALIDATE to add or remove mapping for a specific userspace memory region. The vhost-vDPA API is designed to be type agnostic, but it allows net device only in current stage. Due to the lacking of control virtqueue support, some features were filter out by vhost-vdpa. We will enable more features and devices in the near future. Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200326140125.19794-8-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>		2020-04-02 10:41:40 -04:00
..
iotlb.c	vhost: factor out IOTLB	2020-04-01 12:06:26 -04:00
Kconfig	vhost: introduce vDPA-based backend	2020-04-02 10:41:40 -04:00
Makefile	vhost: introduce vDPA-based backend	2020-04-02 10:41:40 -04:00
net.c	vhost: factor out IOTLB	2020-04-01 12:06:26 -04:00
scsi.c	vhost: allow per device message handler	2020-04-01 12:06:26 -04:00
test.c	compat_ioctl: remove most of fs/compat_ioctl.c	2019-12-01 13:46:15 -08:00
test.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
vdpa.c	vhost: introduce vDPA-based backend	2020-04-02 10:41:40 -04:00
vhost.c	vhost: factor out IOTLB	2020-04-01 12:06:26 -04:00
vhost.h	vhost: factor out IOTLB	2020-04-01 12:06:26 -04:00
vringh.c	vringh: IOTLB support	2020-04-01 12:06:26 -04:00
vsock.c	vhost: allow per device message handler	2020-04-01 12:06:26 -04:00